Transcript hppc - Natural Disasters

This is a three day record of
The one hurricane over top of
South Florida heading east
To west.
Hurricane Floyd was
a Category 3 storm that
brought intense rains
and record flooding to
the eastern United States
and Canada. Nearly 90
percent of the fatalities
associated with this
storm were drownings
due to inland flooding.
Buildings can be constructed to be
hurricane-resistant by
implementing such practices as
tying down rafters and including
strong metal shutters to cover
windows and doors in the event
of a hurricane.
Hurricanes form in tropical regions where there is warm
water ( 27 degrees Celsius), moist air and converging
equatorial winds. Most Atlantic hurricanes begin off the west
coast of Africa, starting as thunderstorms that move out over the
warm, tropical ocean waters. A thunderstorm becomes a
hurricane in three stages:
*Tropical depression - swirling clouds and rain with
wind speeds of less than 38 mph
*Tropical storm wind speeds of 39 to 73 mph
*Hurricane wind speeds greater than 74 mph
Continuous evaporation-condensation of the water
cycle in the warm, humid ocean air
Patterns of wind shown by **converging winds at
the surface and strong, close-to-same speed winds at
higher altitudes
A difference in air pressure between the surface
and high altitude
** "Converging winds" are winds moving in different directions that run into each other.
Converging winds at the surface collide and push warm, moist air upward. This rising air
reinforces the air that is already rising from the surface, so the circulation and wind speeds
of the storm increase.
Thunderstorms can be created by most generally
convectional precipitation. It can take several hours to
several days for a thunderstorm to develop into a hurricane.
Although the whole process of hurricane formation is not
entirely understood.
Once a normal thunderstorm
has intensified to the point where
its maximum average winds are
between (39-73 mph), it becomes a
tropical storm. It is at this time that
it is given a name. During this
time, the storm itself becomes
more organized and begins to
become more circular in shape.
As surface pressures
continue to drop, a tropical
storm becomes a hurricane
when sustained wind speeds
reach (74 mph). A rotation
develops around the central
core.
After a hurricane forms, it has three main parts:
Eye - the low pressure, calm center of circulation
Eye wall - area around the eye with the fastest,
most violent winds
Rain bands - bands of thunderstorms circulating
outward from the eye that are part of the
evaporation/condensation cycle that feeds the storm
Every year between June
1 and November 30 (commonly
called hurricane season),
hurricanes threaten the eastern and
gulf coasts of the United States,
Mexico, Central America and the
Caribbean.
Tropical cyclones are greatly
intensified low pressure cells
that spend most of their lives
over the oceans. In the
Atlantic Ocean, they are called
hurricanes. In the Pacific Ocean,
they are usually referred to as typhoons.
Class #1-64-82kts
Class #2-83-95kts
Class #3-96-113kts
Class #4-114-134kts
Class #5-135kts plus
On average, less than
two hurricanes per year
reach the eastern seaboard
Of North America from the
western coast of Africa.
However, several more
usually come close enough
to the coast to cause at least
some damage. In the western
North Atlantic Ocean, an
average of nine hurricanes
occur each year. The eastern
North Pacific Ocean has an
average of four to five more
tropical cyclones per year than
the western North Atlantic.
RED-Hurricane
YELLOW-T,Storm
GREEN-T,Depression
The hurricane premium for a
$200,000 Canadian beach home
has soared from $316 in 1995
to $1,876now. In July, it's
scheduled to climb to $2,300.
Prepare a personal evacuation plan.
Identify ahead of time where you
could go if you are told to evacuate.
Choose several places--a friend's
home in another town, a motel,
or a shelter.
High-pressure air in the
upper atmosphere
(above 30,000 ft / 9,000 m)
over the storm's center also
removes heat from the rising
air, further driving the air cycle
and the hurricane's growth.
As high-pressure air is sucked
into the low-pressure center of
the storm, wind speeds increase.
Buildings can be constructed to be
hurricane-resistant by implementing
such practices as tying down rafters
and including strong metal shutters
to cover windows and doors in the
event of a hurricane. Individuals can
prepare for hurricanes by stocking
appropriate materials such as food,
water, batteries, etc., or evacuating
if a hurricane is expected to directly
"hit" their community.
Hurricanes have been around
sense the beginning of time
because there’s always a high
and low pressure cell that
collide and create a hurricane.
this hurricane caused
46 deaths and $100
million in damage in
the United States,
the worst effects
occurred at sea
where it wreaked
havoc on World
War II shipping.
The graphs
show
population
change for the
period 19002000
(if available)
versus
hurricane
strikes
(1900-2002).
Tropical Depression
An organized system of clouds and thunderstorms with a defined circulation
and top sustained winds of less than 39 miles-per-hour.
Tropical Storm
An organized system of strong storms with a defined circulation and top
sustained winds of between 39 - 74 mph.
Tropical Storm Watch
Tropical storm conditions are possible in the specified area of the watch
within 36 hours.
Tropical Storm Warning
Tropical storm conditions are expected in the affected area within 24-hours.
Hurricane
An intense tropical weather system with a well-defined circulation and a
sustained wind speed of 74 mph or higher.
Hurricane Watch
Hurricane conditions are possible within the specified area within 36 hours. At this point,
take immediate action to protect your family and property.
Hurricane Warning
Hurricane conditions are expected in the specified area within 24 hours.
Storm Surge
A rapidly rising dome of seawater up to 20 feet high that arrives with a hurricane.
Evacuation zones are identified according to their susceptibility to this occurrence
When hurricanes occur they can devastate coastal regions and
ruin fields ,house’s,crops and lives, If you don’t have
INSURANCE. When a hurricane rips through a community or
village , lives can also be lost.
http://home.att.net/~typhoon1/index.html
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/stages/home.rxml
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/home.rxml
http://cimss.ssec.wisc.edu/tropic/tropic.html
http://www.aoml.noaa.gov/hrd/weather_sub/faq.html
http://encarta.msn.com/encnet/refpages/RefArticle.aspx?refid=761565
992
http://www.naturalhazards.org/investigate/hurricanes/index.html
http://www.miami.com/mld/miami/2698591.htm
http://www.fpl.com/storm/contents/storm_terms.shtml
http://www.srh.noaa.gov/jan/hrcn4.html